The PS501 combines a high-performance, low-power Microchip PIC18 microcontroller core together with proprietary monitoring/control algorithms and 3D cell models stored in 16 Kbytes of on-chip reprogrammable Flash memory. Analog resources include a 16-bit sigma-delta integrating A/D and mixed signal circuitry for precision measurement of battery current, temperature and voltage. On-chip EEPROM is provided for storage of user customizable and “learned” battery parameters. An industry standard 2-wire SMBus interface supports host communication using standard SBData commands and status. Additional integrated features include a high accuracy on-chip oscillator and temperature sensor. Twelve general purpose pins support charge or safety control or user programmable digital I/O. Eight of them can be used as LED drivers and two are open drain for direct FET drive.

• Single chip solution for rechargeable battery management
• Footprint compatible with PS401
• Embedded PowerSmart® patented algorithms contained in customizable on-chip 16-Kbyte Flash memory
• User configurable and “learned” parameters stored in on-chip 256 x 8 EEPROM
• Algorithms and parameters fully field reprogrammable via SMBus interface
• Integrated precision silicon time base
• On-chip regulator generates precision digital and analog supply voltages directly from pack voltage
• Flexible power operating modes:- Run: Continuous operation- Sample: Periodic measurements at programmable intervals- Sleep: Shutdown mode due to low voltage.Power consumption less than 25 µA.- Shelf-Sleep: Shuts off PS501 power consumption for pack storage with automatic wake-up on pack insertion. Power consumption is less than 1 µA.
• Integrated Reset Control- Power-on Reset- Watchdog Timer Reset- Brown-out Detection Reset